/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package info.jtrac.wicket;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.AbstractBehavior;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.form.FormComponent;

/**
 * switches on css styling to highlight invalid form input
 */
public class ErrorHighlighter extends AbstractBehavior {
    
    private FormComponent fc;
    
    public ErrorHighlighter() {
        // zero arg constructor
    }
    
    public ErrorHighlighter(FormComponent fc) {
        this.fc = fc;
    }
    
    @Override
    public void bind(Component c) {
        if (c instanceof FormComponent) {
            fc = (FormComponent) c;
        }
    }
    
    @Override
    public void onComponentTag(Component c, ComponentTag tag) {
        if (!fc.isValid()) { 
            tag.put("class", "error-input"); 
        }
    }    
    
}
